Alaska earthquakes

M2.5 earthquake 176 km S of Adak, Alaska

A magnitude 2.5 earthquake struck 176 km S of Adak, Alaska on Sun, Aug 21, 2022, 12:39 AM HADT (09:39 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.4 200 km SSW of Adak, Alaska. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
2.5 (ml), micro
Local time
UTC
2022-08-21 09:39:43 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.292° N, 176.807° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 6.7 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.15
Depth from
Operator assigned
Station coverage gap
255°, poorly surrounded by stations
Stations used
15

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 1.6106 km SSW of Adak, Alaska · 1500 days ago · 18 km deep · 73 km away
  2. 3.4200 km SSW of Adak, Alaska · 1499 days ago · 40 km deep · 79 km away
  3. 2.1160 km S of Adak, Alaska · 1494 days ago · 26 km deep · 22 km away
  4. 1.6123 km S of Adak, Alaska · 1493 days ago · 5 km deep · 54 km away
  5. 2.6Andreanof Islands, Aleutian Islands, Alaska · 1491 days ago · 17 km deep · 18 km away
  6. 2.7178 km SSW of Adak, Alaska · 1490 days ago · 10 km deep · 77 km away
  7. 1.9162 km S of Adak, Alaska · 1488 days ago · 8 km deep · 25 km away
  8. 2.2187 km S of Adak, Alaska · 1485 days ago · 6 km deep · 16 km away
  9. 2.1154 km S of Adak, Alaska · 1456 days ago · 13 km deep · 35 km away
  10. 2.5171 km S of Adak, Alaska · 1444 days ago · 36 km deep · 6 km away
  11. 2.8177 km SSW of Adak, Alaska · 1443 days ago · 10 km deep · 30 km away

Before

  1. 3.9214 km SSW of Adak, Alaska · 1502 days ago · 10 km deep · 52 km away
  2. 3.0177 km S of Adak, Alaska · 1502 days ago · 10 km deep · 13 km away
  3. 3.298 km SSE of Adak, Alaska · 1505 days ago · 31 km deep · 96 km away
  4. 1.6147 km SSE of Adak, Alaska · 1506 days ago · 25 km deep · 86 km away
  5. 1.9Andreanof Islands, Aleutian Islands, Alaska · 1511 days ago · 26 km deep · 17 km away
  6. 2.2222 km SSW of Adak, Alaska · 1511 days ago · 33 km deep · 66 km away
  7. 1.6158 km SSE of Adak, Alaska · 1514 days ago · 4 km deep · 49 km away
  8. 2.5212 km SSW of Adak, Alaska · 1529 days ago · 18 km deep · 45 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000ipil (also filed as ak022apht819). Read Tue, Sep 29, 2026, 9:33 PM UTC.